Multiple Tiering policies can be created. It is also possible to define the same Tiering policy to multiple Tier pools.
The items which can be specified as Tiering policy are as follows.
Item | Specification | Explanation |
|---|---|---|
Policy Name | Required | This is the name of the Tiering policy. |
Execution Mode | Optional | This is the Execution Mode that specifies the mode of operation of the Automated Storage Tiering. |
Evaluation Period | Optional | This is the period of which access status data will be evaluated. |
Evaluation Standard | Optional | This is the standard for evaluation of the access status data. |
Automated Storage Tiering Execution Time | Optional | This is the time at which evaluation of access status data, and relocation of data within the volume will be started. |
Automated Storage Tiering Time Limit | Optional | This is the time that will need to elapse from the Automated Storage Tiering Execution Time for relocation of the data within the volume to be discontinued. |
Days of the Week subject to Evaluation | Optional | These are the days of the week to be subject to evaluation when evaluating the access status data. |
Time of the Day subject to Evaluation | Optional | This is the time of the day to be subject to evaluation when evaluating the access status data. |
Configuration of Days to exclude from Evaluation | Optional | These are the days to be excluded from being subject to evaluation of the access status data. |
Data Type | Optional | This is the type of access status data. |
Data Range of Tier Level | Optional | This is the specification of whether to manually configure the data range of each sub-pool or to automatically configure these with the system. When "Automatic Configuration" (recommended) is specified, the system will automatically decide the standards for relocation of the data within the volume. |
Data Range of Low | Optional | This is the range of IOPS values to act as a standard upon location to the Low sub-pool of the Tier pool. (*2) |
Data Range of Middle | Optional | This is the range of IOPS values to act as a standard upon location to the Middle sub-pool of the Tier pool. (*2) |
Data Range of High | Optional | This is the range of IOPS values to act as a standard upon location to the High sub-pool of the Tier pool. (*2) |
*1: When a specification is omitted for the item of which specification is "Optional", a default value will be configured.
*2: In cases when a range has not been specified, relocation will be performed automatically by the system.
Refer to "Create Tiering Policy" in the ETERNUS SF Web Console Guide for information on how to create Tiering policies.
Point
When the Execution Mode is set to "Auto" and the Data Range of Tier Level is set to "Automatic Configuration", the system will automatically decide the standards for relocation of data within the volume, and optimally perform the relocation. Normally, specification with this combination is recommended.
When setting the Data Range of Tier Level to the manual configuration, in order to assess the optimal value for the data range of each sub-pool, it is recommended that the Execution Mode is set to "Semi-Auto" or "Manual" and test runs of evaluation and relocation are performed.
Example
It explains timing from which the evaluation and relocation are executed according to the Tiering policy by using the following examples.
It is an example of executing the Automated Storage Tiering based on the access status at 8:00-17:00 at 18 o'clock every day.
Evaluation Period is set to "1Day", Time of the Day subject to Evaluation is set at 8:00-17:00, and Automated Storage Tiering Execution Time is set to 18:00.
The evaluation to the access situation data of 8:00-17:00 is begun at 18:00 every day.
It is an example of executing the Automated Storage Tiering among one week based on the access status from Monday to Friday at 0 o'clock of Saturday.
Evaluation Period is set to "7Day", Day of the Week subject to Evaluation is set on Monday - Friday, and Automated Storage Tiering Execution Time is set to 0:00.
The evaluation to the access situation data of Monday - Friday is begun at 0:00 the following Saturday on the seventh every week when Automated Storage Tiering to the Tier pool of 0:00 of Saturday begins.
It is an example of executing the Automated Storage Tiering based on the access status of eight hours every eight hours.
Evaluation Period is set to "8Hour".
The evaluation to the access situation data of six hours from 2:00 to 8:00 is begun at 8:00 when Automated Storage Tiering to the Tier pool of 2:00 begins to make 0:00 a starting point for the Evaluation Period. Eight hours until 16:00-24:00 are evaluated to 24:00 for eight hours until 8:00-16:00 at 16:00
after that.
